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Here's a nice atomic number trivia question: What is the atomic number of the element whose name is formed by deleting the first letter of the name of another element? The +1 charge tells us there is one more proton than there are electrons.
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The problem tells us explicitly that there are 159 neutrons.Įlectrons (negative) counterbalance protons (positive). Its mirror would have 14 protons and 18 neutrons.īonus Example: What is the mass number of an ion with 105 electrons, 159 neutrons, and a +1 charge? Solution: Argon-32 has 18 protons and 14 neutrons. Three protons and 8 neutrons means a mass number of 11.Įxample #10: What is the nuclear mirror for argon-32? Solution: The nuclear mirror would have 3 protons and 8 neutrons (the opposite of 8 protons and 3 neutrons for O-11). The answer is 10 electrons.Įxample #9: Two atoms are said to be nuclear mirrors when they have opposite numbers of protons and neutrons. Solution: The positive charge means the electrons are less in number than the protons.Ī +1 charge means one less electron than the number of protons. The answer is 18 electrons.Įxample #8: How many electrons does the ion 11 23 Na + have? If the charge is positive, that means less electrons than protons.Ī −1 charge means one more electron than protons. If there is a negative charge, then that means more electrons that protons. And, remember, the atomic number gives us the number of protons in the nucleus.
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The answer starts with knowing that a neutral atom has the same number of electrons as protons. Solution: This is a question that teachers like to surprise students with. The term "symbol-mass number" is not a standard term.Įxample #7: How many electrons does the ion 17 35 Cl¯ have? (c) Write the two nuclear symbols in "symbol-mass number" style.Īdd the atomic number (17) and the number of neutrons (18) to get the mass number of 35.Īdd the atomic number (17) and the number of neutrons (20) to get the mass number of 37. (b) Write the nuclear symbol for the chlorine isotope having 20 neutrons. We can determine the number of electrons by subtracting the atomic number from the mass number, leaving us with 21 neutrons for Ca-41, 22 neutrons for K-41, and 23 neutrons for Ar-41.Įxample #6: (a) Write the nuclear symbol for the chlorine isotope with 18 neutrons. The element symbol allows up to identify the number of protons in each element: Ca has 20, K has 19, and Ar has 18. (It does not tell us the number of neutrons.) The 41 following the element symbol tells us the sum of the number of protons and number of neutrons. Then, determine the number of neutrons in each isotope.Įxample #5: True or False: atoms of Ca-41, K-41 and Ar-41 have the same number of neutrons. The number of neutrons is 48 minus 22 = 26.Įxample #4: Write the nuclear symbols for the three isotopes of oxygen that have mass numbers 16, 17, and 18. The 22 is the atomic number for titanium and 48 is its mass number. The number of protons and neutrons in the nucleus of the atom.
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The number of protons in the nucleus of the atom. The three, subscripted left, is the atomic number and the seven, superscripted left, is the mass number.Ītomic number -> 2 mass number -> 4 He The element symbol, Li, is that for lithium. The nuclear symbol consists of three parts: the symbol of the element, the atomic number of the element and the mass number of the specific isotope. ChemTeam: Nuclear Symbol The Nuclear Symbol